diff --git a/t/t2025-worktree-add.sh b/t/t2025-worktree-add.sh
index 3694174989..0a804dab63 100755
--- a/t/t2025-worktree-add.sh
+++ b/t/t2025-worktree-add.sh
@@ -123,10 +123,10 @@ test_expect_success 'checkout from a bare repo without "add"' '
 test_expect_success 'checkout with grafts' '
 	test_when_finished rm .git/info/grafts &&
 	test_commit abc &&
-	SHA1=`git rev-parse HEAD` &&
+	SHA1=$(git rev-parse HEAD) &&
 	test_commit def &&
 	test_commit xyz &&
-	echo "`git rev-parse HEAD` $SHA1" >.git/info/grafts &&
+	echo "$(git rev-parse HEAD) $SHA1" >.git/info/grafts &&
 	cat >expected <<-\EOF &&
 	xyz
 	abc